如何从祖先生成json树 [英] How to generate json tree from ancestry
本文介绍了如何从祖先生成json树的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我用祖先树成目标树.我想使用json将那棵树的内容发送到浏览器.
I use ancestry to make a tree of goals. I would like to send the contents of that tree to the browser using json.
我的控制器是这样的:
@goals = Goal.arrange
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @goals }
format.json { render :json => @goals}
end
当我打开json文件时,得到以下输出:
When I open the json file, I get this output:
{"#<Goal:0x7f8664332088>":{"#<Goal:0x7f86643313b8>":{"#<Goal:0x7f8664331048>":{"#<Goal:0x7f8664330c10>":{}},"#<Goal:0x7f8664330e68>":{}},"#<Goal:0x7f86643311b0>":{}},"#<Goal:0x7f8664331f70>":{},"#<Goal:0x7f8664331d18>":{},"#<Goal:0x7f8664331bd8>":{},"#<Goal:0x7f8664331a20>":{},"#<Goal:0x7f86643318e0>":{},"#<Goal:0x7f8664331750>":{},"#<Goal:0x7f8664331548>":{"#<Goal:0x7f8664330aa8>":{}}}
如何在json文件中呈现目标对象的内容?
How can I render the contents of the Goal-objects in the json file?
我已经尝试过了:
@goals.map! {|goal| {:id => goal.id.to_s}
但是它不起作用,因为@goals是有序哈希.
but it doesn't work, since @goals is an ordered hash.
推荐答案
The solution is to put this method in the goal model:
def self.json_tree(nodes)
nodes.map do |node, sub_nodes|
{:name => node.name, :id => node.id, :children => Goal.json_tree(sub_nodes).compact}
end
end
,然后使控制器看起来像这样:
and then make the controller look like this:
@goals = Goal.arrange
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @goals }
format.json { render :json => Goal.json_tree(@goals)}
end
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